Lock.



APPLICATION FILED Nov.1'5, 190s.

" III/Ill UNITED STATES PATENT OFFICE.-

JAMES C. DAWSON, OF ST. LOUIS, MISSOURI, ASSIGNOR TO SIEBER & TRUS- SELLMANUFACTURING COMPANY, A CORPORATION OF ILLINOIS.

LOCK.

4Specification of Letters Patent.

Patented April 16, 1907.

Original application lled April 30,1906, Serial No. 314,436. Dividedandthis application filed November 15, 1906. Serial No. 348,609.

To a/ZZ whom it may concern:

Be it known that I, JAMES C. DAWSON, a resident of the city of St.Louis, State of Missouri, and a citizen of the United States, haveinvented certain new and useful Improvements in Locks, of which thefollowin is a specification, and-which are illustrated 1n the accomanying drawings, forming a part tliereoi).

This invention has been divided from my copending ap lication for patenton looseleaf binders, erial No. 314,435, filed April bolt and ya tumblerfor securing the bolt in its' advanced position, and has for itsobject-t provide a lock particularly adapted for use in situations inwhich a portion of the bolt is necessarily exposed when the lock isclosed.

A detaill of the invention provides for a cam en a ement between atumbler of the lock an t 1e bolt when the latter occupies anintermediate position to effect the withdrawal ofthe bolt.

In the accompanying drawings, Figure 1 is an end elevation of a lockconstructed according to the invention and shows a detail 0f thelsheet-holding mechanism of a looseleaf ledger to which the lock may beapplied. Fi 2 is a longitudinal section on the line 2 2 of ig. 1. Figs.3 and .4 are lan views showing the mechanism of the loc indifferentpositions. Fig. 5 shows a tumbler used in the lock, and Fig. 6 is adetail view of a key used for opening the lock.

The particular form of lock illustrated in the drawingsmay be employedfor preventing the unwarrantable opening of the binder mechanism of aloose-leaf ledger having 'relatively movable clamping-plates. forgripping the sheets to be bound. As shown, the binder mechanismcomprises an intermediate back member 12, upon which the clampingmembers, as 10 11, are slidably mounted, and each of these memberscarries a plurality of telescoping bindingost members 13.

The movement of t e clampin members 10 and 11 ,to open and close theblnder is efected by means of cam-levers 14 15, pivotally mounted on theback member-12 and.

operatively engaged b a cross-head 16, carried b a threaded ro 17. Oneend of the threa ed rod 17 registers with an opening 18 in the end ange19 of the back member 12,

and through this opening a key or crank-rod (not shown) may be insertedto turn the threaded rod 17.

The lock forming the subject of the invention is shown applied to theframe of the binder to Iprovide means for closing the opening 18. tpreferably comprises a ch ambered casing 20, which, as shown, hasalaterallyextending iange 21 for receiving attachingscrews 22 23,enteringr the back member 12 of the binder. A reeiprocable bolt 2 4extends through the casing and, as shown, is provided upon one of itsends with a thumbpiece 25 for the application of pressure to close thelock.l Preferably, as most clearly shown in Fig. 2, the thumbieee 25occupies a osition flush with the wa l of the casing 20 w en the lock isclosed.

The bolt 24 is provided with one or more lugs adapted to be engaged bythe lock-tumblers. Two such lugs 26 27 are shown, and these take theform of lateral wings, each having a forwardly-inclined face 28 and anabrupt shoulder 29. A tumbler, as 30 3l, moves across the path of eachof the wings 26 27 and is most conveniently fixed. against lateraldisplacement by means of pins 32, mounted in the wall ofthe lock-casingand engaging slots 33, formed in the tumbler. Each of the'tumblers isprovided with a shoulder, as 34 35, for engaging a -lug or wing of thebolt and with a flange, as indicated at 36 37, adapted to be engaged bythe wards of a ke the ange 36 of the tumbler 30 preferab y extendingacross the face of the bolt 24 to a position adjacent the key-openin 38in the front Wall of the casing 20. Pre erably the tumblers of the lockare spring-advanced, and in the form of construction illustrated aretractile spring 39, reacting between the two tumblers, is provided forthis purpose.

y In use the iange 21 of the lock-casing may he covered by the leaves ofthe ledger secured between the clamping-plates 1U 11, thereby preventinaccess to the screws 22- 23 to remove the ook from the binder-frame. Thebolt 24 is advanced to close the opening 18 by pressure on the thumbiece25, and when IOC in this position it is firm y secured against t eaperture 38 in the wall of the lock-casing,

and when turned its wards engage the flanges 36 37 of the tumblers' toretract them, and one of them contacts with a ortion of the bolt, asthe`inclined face of tie wing 27, to raise it. When the key has beengiven a partial rotation, the tumblers 30 31 are released and areadvanced by the spring 39 upon the inclined faces '28 of the wings 26and 27, respectively, engaging them by a cam action to complete theraising of the bolt. This action is facilitated by providing one of thetumbler's, as 31 with an inclined forward face 41. When the bolt 24 isadvanced in closing the lock, the tumblers 30 31 are displaced to allowthe wings of -the bolt to pass by a similar cam action.

The number of tumblers in the lock and the configuration of the wards ofthe key 40 may be varied at will to increase the diiiiculty of ickingthe lock or to provide a series of loc cs for each of which a `differentkey is required.

I -claim as my invention* 1. In a lock, in combination,apressureadvanced bolt having a lug, a spring-advanced tumbler movableacross the path of the lugmen the bolt, the rear face of the tumblerbeing inclined and the forward face of the tumbler being abrupt, and akey for withdrawing the tumbler and partially Withdrawing the bolt.

2. In a lock, in combination, a pressureadvanced bolt having a lug, aspring-advanced tumbler movable across the path of the lug 0n the bolt,the rear face of the tumbler and the forward -face of the bolt-lug bcinginclined and the forward face of the tumbler and the rear face of' thebolt-lug being abrupt, and a -key for withdrawing the tunibler andpartially withdrawing the bolt.

3. In a lock, in combination, a pressureladvanced bolt having a lateralwing, one face ofthe wing being inclined and the opposite face of thewing being abrupt, a spring-advanced tumbler en aging the wing, and akey engaging the turnb er to move it away from the bolt and engaging thebolt to withdraw it.

4. In a lock, in combination, a casing, a reciprocable bolt extendingthrough the casin and havin lateral wings with abrupt and ob iq-ueshoulders, a pair of spring-advanced tumblers engaging such shoulders,and a key for withdrawing the tu-mblers and partially withdrawing thebolt.

5. In a lock, in combination, a chambered casing, a reciprocable boltextending through thecasing and having lateral wings each having oneabrupt shoulder and one inclined face, a pair of recprocative tumblers,one engaging each wing, a retractile spring reacting 4between thetumblers to hold them in engagement with the bolt, and a ltwo-ward keyengaging the tumblers to move them away from the bolt and engaging awing of the bolt to raise it.

ROBT. H. CCNE, Jr., W. J. WARD.

